Jolly The best method I've found is to add an additional custom search engine in Firefox that uses the URL "https://kagi.com/summarizer/index.html?url=%s". Then you can quickly summarize the page you're on by tapping the address bar, tapping the search engine icon next to the address, selecting the custom search engine you added, then hitting enter (submit, go, navigate, whatever you prefer to call it lol).
It ends up taking the same number of taps (4) to do that as if you were to navigate to the addon's UI to use the summarize button.
